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The stats I linked to are across ALL schools, but yes, at any given school there will be fluctuations. As to why CompE? I think it is because CompE’s are more likely to produce a final product than most engineers, and the closer you are to the sale, the more money you will make (on average).</p>
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California in particular is high on software right now, it does not surprise me at all that California CS grads make more money than California EE grads. That having been said, remember that while the data I linked to is from the IRS and is therefore a mandatory report, colleges use voluntary reporting with often very small sample sizes that can have a high margin of error.</p>